Elgg 2.3.8, elggBook 2.4.4
On the dashboard - when I write a comment and click Enter, I receive an error message:
The requested action (comments/save) was not defined in the system.
Please advise
Thank you

Elgg 2.3.8
I happened to come across a problem with the Theme Sandbox.
Clicking on Components brings a message:
Unexpected error while performing an AJAX call. Maybe the connection to the server is lost.
Clicking on Forms...